INSTALLATION INSTRUCTIONS

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1 2014 Lennox Industries Inc. Dallas, Texas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE General This SL18XC1 outdoor air conditioner with all-aluminum coil is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. See the Lennox SL18XC1 Product Specifications bulletin (EHB) for approved indoor component match ups. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. NOTICE! For more in-depth information, consult the Installation and Service Procedures manual, available as Corp L10 on DaveNet or through the Technical Support department at INSTALLATION INSTRUCTIONS Dave Lennox Signature Collection SL18XC1 System AIR CONDITIONERS /2014 Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent) or service agency. CAUTION Litho U.S.A. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch. STEP 1 -- SETTING THE UNIT -- Clearances CLEARANCE ON ALL SIDES INCHES (MILLIMETERS) MINIMUM CLEARANCE ABOVE UNIT 12 (305) 6 (152) CONTROL PANEL ACCESS LOCATION 30 (762) NOTES: Clearance to access panel must be 30 inches (762mm). Clearance to one of the other three sides must be 36 inches (914mm). Clearance to one of the remaining two sides may be 12 inches (305mm) and the final side may be 6 inches (152mm). 48 (1219) 36 (914) MINIMUM CLEARANCE BETWEEN TWO UNITS ACCESS PANEL 24 (610) SET CONNECTIONS REAR VIEW OF UNIT FIGURE 1 Page 1

2 STEP 1 -- SETTING THE UNIT (Continued) -- Dimensions / Placement UNIT DIMENSIONS - INCHES (MM) (1003) DISCHARGE AIR ELECTRICAL INLETS 35. (902) [-030 THROUGH -042] 41 (1040) [-024, -048, -060] 47 (1194) SUCTION INLET LIQUID INLET (470) 8.00 (203) SIDE VIEW UNIT SUPPORT FEET 1 (25) ACCESS VIEW 16-7/8 (429) 26-7/8 (683) BASE WITH ELONGATED LEGS 8-3/4 (222) 3-3/4 (95) 3-1/8 (79) To prevent personal injury, as well as damage to panels, unit or structure, observe the following: While installing or servicing this unit, carefully stow all removed panels so that the panels will not cause injury to personnel, objects or nearby structures. Also, take care to store panels where they will not be subject to damage (e.g., being bent or scratched). While handling or stowing the panels, consider any weather conditions (especially wind) that may cause panels to be blown around and damaged. CAUTION As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and use protective clothing. 30-3/4 (781) 4-5/8 (117) NOTICE! Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to degrade. Failure to follow this notice could result in damage to roof surface. IMPORTANT! Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Prolonged exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit. This will diminish unit performance and longevity. Page 2

3 PLACEMENT INSTALL UNIT AWAY FROM WINDOWS TWO 90 ELBOWS INSTALLED IN SET WILL REDUCE SET VIBRATION FIGURE 2 SLAB MOUNTING Install unit level or, if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [ mm per 1.5 m]) away from building structure. BUILDING STRUCTURE DISCHARGE AIR STABILIZING UNIT ON UNEVEN SURFACES Slab Mounting #10 X 1/2 LONG SELF-DRILLING SHEET METAL SCREWS STABILIZING BRACKET (18 GAUGE METAL 2 WIDTH; HEIGHT AS REQUIRED) #10 X 1-1/4 LONG HEX HD SCREW AND FLAT WASHER Concrete slab use two plastic anchors (hole drill 1/4 ) Deck Top Mounting COIL CORNER POST BASE PAN Stabilizing bracket - 18 gauge metal. 2 (.8mm) width; height as required. Bent to form right angle as shown. SAME FASTENERS AS SLAB SIDE MOUNTING. MINIMUM ONE PER SIDE MOUNTING SLAB FOR EXTRA STABILITY 2 (.8MM) SCH 40 FEMALE THREADED ADAPTER FIGURE 3 ELEVATED SLAB MOUNTING USING FEET EXTENDERS 2 (.8MM) SCH 40 MALE THREADED ADAPTER GROUND LEVEL Use additional 2 SCH 40 male threaded adapters which can be threaded into the female threaded adapters to make additional adjustments to the level of the unit. Install one bracket per side (minimum). For extra stability, install two brackets per side, two inches (51mm) from each corner. IMPORTANT! Unit Stabilizer Bracket (field-provided): Always use stabilizers when unit is raised above the factory height. (Elevated units could become unstable in gusty wind conditions.) Stabilizers may be used on any unit installed on unstable and uneven surfaces. FIGURE 5 LEG DETAIL FIGURE 4 BASE STEP 2 -- ELECTRICAL -- Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC). Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size. Page 3 SL18XC1 SERIES

4 24VAC TRANSFORMER Use the transformer provided with the furnace or air handler for low voltage control power (24VAC - 40 VA minimum). Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes. Line voltage is present at all components when unit is not in operation on units with single pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies. IMPORTANT! If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1. Size Circuit and Install Disconnect: Refer to unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker size (HACR per NEC). Install power wiring and properly sized disconnect switch. NOTE Units are approved for use only with copper conductors. Ground unit at disconnect switch or connect to an earth ground. 2. Install Thermostat: Install room thermostat (ordered separately) on an inside wall in the center of the conditioned area and 5 feet (1.5m) from the floor. The thermostat should not be installed on an outside wall or where it can be affected by sunlight or drafts. NOTE 24VAC, Class II circuit connections are made in the control box. ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components. Take care during unit installation and service to protect the unit's electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit, the control and the technician at the same electrostatic potential. Touch hand and all tools on an unpainted unit surface before performing any service procedure to neutralize electrostatic charge. A. ROUTE CONTROL WIRES NON-COMMUNICATING Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit. All low voltage wiring must enter unit through provided field-installed busing installed in electrical inlet. Run 24VAC control wires through hole with grommet. Make 24VAC control wire connections to heat pump control (A175). NOTE Do not bundle any excess 24VAC control wires inside control box. NOTE Wire tie provides low voltage wire strain relief and maintains separation of field-installed low and high voltage circuits. NOTE For proper voltages, select control wires gauge per table below. B CONTROL (A175) WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING MORE THAN 100' (30 METERS) 16 35ºC MINIMUM. A HOLE B. ROUTE CONTROL WIRES COMMUNICATING Maximum length of wiring (18 gauge) for all connections on the RSBus is 10 feet (457 meters). Wires should be color-coded, with a temperature rating of 95 º F (35 º C) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through provided field-installed busing installed in electrical inlet. Communicating systems using the icomfort -enabled thermostat require four thermostat wires between the thermostat and the furnace/air handler control and four wires between the outdoor unit and the furnace/air handler control. When a thermostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise (see illustration below). Use a wire nut to bundle the four unused wires at each end of the cable. Each bundle should also include an additional wire that should be connected on each end to the C terminal as shown in figure 7. icomfort -enabled Outdoor Unit Single Wire To C Terminal icomfort -enabled Indoor Unit Single Wire To C Terminal icomfort -enabled thermostat Unused Wires Unused Wires FIGURE 6 Page 4

5 B. ROUTE HIGH VOLTAGE AND GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting. WATERTIGHT CONDUIT FITTING WATERTIGHT FLEXIBLE CONDUIT TO SERVICE DISCONNECT BOX GROUND LUG* CONTACTOR CONTROL BOX ELECTRICAL INLET (HIGH VOLTAGE) WIRING ENTRY POINTS ELECTRICAL INLET (CONTROL WIRING LOW VOLTAGE). USE BUSHING PROVIDED IN BAG ASSEMBLY HERE. ACCESS VIEW * Attach field-provided green ground wire to provided ground lug. NOTE - Grounding wire must be a single, continuous wire run from unit ground lug to earth ground. DO NOT splice wire. FIGURE 7 STEP 2 -- ELECTRICAL (Continued) -- Outdoor Control (A175) Jumpers and Terminals J4 - COMPRESSOR SHIFT DELAY 30 SECOND DELAY (DEFAULT) 30 7-SEGMENT DISPLAY PUSH BUTTON J3 - DEFROST AUTO (HEAT PUMP ONLY) JUMPER ON PINS 1 AND 2 DEFROST AUTO ENABLED JUMPER ON PINS 2 AND 3 DEFROST AUTO DISABLED (DEFAULT) ON OFF 0 SECOND DELAY 0 J1 - DEFROST TERMINATION TEMPERATURE (HEAT PUMP ONLY) J2 - SECOND-STAGE LOCK-IN TEMPERATURE (TWO-STAGE HEAT PUMP ONLY) 55 DEGREE TARGET DEGREE TARGET 45 DEGREE TARGET 40 DEGREE TARGET (DEFAULT) SECOND-STAGE LOCK-IN TEMPERATURE MAX TARGET 90 DEGREE TARGET 70 DEGREE TARGET MAX MAX MAX DEGREE TARGET (DEFAULT) DS TO R LINK - EDA APPLICATION (TWO-STAGE UNIT ONLY) MAX (DEFAULT WHEN JUMPER IS REMOVED OR MISSING) NOTE - LINK NOT APPLICABLE TO SINGLE-STAGE UNIT. CUTTING LINK WILL HAVE NO AFFECT ON OPERATION OF SINGLE-STAGE UNITS. CUT FOR HUMIDITROL - ENHANCED DEHUMIFICATION ACCESSORY (EDA) APPLICATIONS. 90 MAX FIGURE 8 Page 5 SL18XC1 SERIES

6 STEP 2 -- ELECTRICAL (Continued) -- Field Control Wiring The following two illustrations provide examples of control wiring connections when using a non-communicating thermostat. For examples of control wiring in complete or partial communicating systems, see the icomfort -enabled thermostat Quick Start Guide which is provided with the thermostat. On board link Low voltage thermostat wiring Flat metal jumper 1. Thermostat T terminals are used for outdoor sensor input. Use for thermostat's outdoor temperature display (optional). 2. R to L connection is required for this model only when used with the ComfortSense 7000 thermostat- (catalog number Y0349). Resistor Kit (catalog number 47W97) required and ordered separately. 3. Air handler control ships from factory with metal jumpers (links) installed across W1, W2 and W3. For single-stage electric heat, do not remove factory-installed metal link. 4. Air handler control ships from factory with metal jumpers installed across W1, W2 and W3. For two-stage electric heat, cut factory-installed metal link between W1 and W2. Then, connect thermostat wire between the air handler control's W2 and the thermostat's W2 terminal. 5. Cut on-board link (clippable wire) DS-R for Humiditrol or Harmony III applications. This will slow the indoor blower motor to the lowest speed setting. See air handler installation instruction or product specifications bulletin for lowest fan speed information. Single Stage Air Conditioner Control 2 W L Y2 Y1 O DS C i i+ R 5 Air Handler Control 3 DS O L H DH R C Y1 Y2 G W3 W2 W1 4 ComfortSense 7000 Thermostats Catalog # Y0349 or Y2081 R G W2 W1 O L H D B Y2 Y1 C T T 1 FIGURE 9 On board link Low voltage thermostat wiring Flat metal jumper 1. Thermostat T terminals are used for outdoor sensor input. Sensor provides input for thermostat's outdoor temperature display (optional). 2. R to L connection is required for this model only when used with the ComfortSense 7000 thermostat - (catalog number Y0349). Resistor Kit (catalog number 47W97) is required and must be ordered separately. 3. Cut on-board link (clippable wire) DS-R for Humiditrol or Harmony IIIt applications. This will slow the indoor blower motor to the lowest speed setting. See furnace installation instruction or product specification bulletin for lowest fan speed information. Furnace Control Single Stage Air Conditioner Control DS W O L 3 L Y2 H Y1 DH O DS R 2 C C i i+ R Y1 Y2 G W2 W1 ComfortSense 7000 Thermostats Catalog # Y0349 or Y2081 R G W2 W1 O L H D B Y2 Y1 C T T 1 Cut on-board link (W914) (clippable wire) from DS to R for dehumidification (Optional). FIGURE 10 Page 6

7 STEP 3 -- REFRIGERANT PIPING Flushing Existing Line Set & Indoor Coil Flush the existing line set per the following instructions. For more information, refer to the Installation and Service Procedures manual available on DaveNet. CAUTION - DO NOT attempt to flush and re-use existing line sets or indoor coil when the system contains contaminants (i.e., compressor burn out). NOTE - When installing refrigerant lines longer than feet, refer to the Refrigerant Piping Design and Fabrication Guidelines manual available on DaveNet (Corp L9), or contact the Technical Support Department Product Application group for assistance. NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp L4 (C-91-4). TABLE 1 REFRIGERANT SET INCHES (MM) Model Size Field Connections Liquid Line /8-030 (10) /8 (10) /8-048 (10) /8 (10) Suction Line 3/4 (19) 7/8 (22) 7/8 (22) 1-1/8. (29) Liquid Line 3/8 (10) 3/8 (10) 3/8 (10) 3/8 (10) Recommended Line Set Suction Line 3/4 (19) 7/8 (22) 7/8 (22) 1-1/8 (29) L15 Line Sets Feet (Meters) L ' (5-15) L ' (5-15) Field Fabricated NOTE Some applications may require a field-provided 7/8 to 1-1/8 adapter IMPORTANT! If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device and reduce system performance and capacity. Failure to properly flush the system per this instruction and the detailed Installation and Service Procedures manual will void the warranty. When using a high pressure gas such as nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kpa). Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly. Failure to follow this warning may result in personal injury or death. Fire, Explosion and Personal Safety Hazard. Failure to follow this warning could result in damage, personal injury or death. Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause fire and/or an explosion, that could result in property damage, personal injury or death. Polyol ester (POE) oils used with HFC-410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections. IMPORTANT! Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COM PRESSOR. Page 7 SL18XC1 SERIES

8 STEP 4 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device 1A TYPICAL EXISTING FIXED ORIFICE REMOVAL PROCEDURE (UNCASED COIL SHOWN) DISTRIBUTOR TUBES LIQUID ORIFICE HOUSING TEFLON RING FIXED ORIFICE OR 1B TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE (UNCASED COIL SHOWN) STUB END TWO-PIECE PATCH PLATE (UNCASED COIL ONLY) DISTRIBUTOR TUBES LIQUID ORIFICE HOUSING EXPANSION VALVE TEFLON RING BRASS NUT TEFLON RING SENSING DISTRIBUTOR ASSEMBLY REMOVE AND DISCARD WHITE TEFLON SEAL (IF PRESENT) LIQUID ASSEMBLY (INCLUDES STRAINER) 1. On fully cased coils, remove the coil access and plumbing panels. 2. Remove any shipping clamps from the liquid line and distributor assembly. 3. Using two wrenches, disconnect liquid line from liquid line orifice housing. Take care not to twist or damage distributor tubes during this process. 4. Remove and discard fixed orifice, valve stem assembly (if present) and Teflon washer as illustrated above. 5. Use a field-provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing. 2 EXISTING INDOOR UNIT LIQUID SERVICE VALVE RECOVERY CYLINDER CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE VAPOR SERVICE VALVE D VAPOR LIQUID A CYLINDER CONTAINING CLEAN HCFC-22* TO BE USED FOR FLUSHING (Positioned to deliver liquid refrigerant) LOW 1 B NEW OUTDOOR UNIT C OPENED GAUGE MANIFOLD TANK RETURN INLET DISCHARGE CLOSED RECOVERY MACHINE HIGH A. HCFC-22 cylinder with clean refrigerant* (positioned to deliver liquid refrigerant) to the vapor service valve. B. HCFC-22 gauge set (low side) to the liquid line valve. C. HCFC-22 gauge set center port to inlet on the recovery machine with an empty recovery tank connected to the gauge set. D. Connect recovery tank to recovery machine per machine instructions. Page 8 DISTRIBUTOR ASSEMBLY MALE EQUALIZER FITTING EQUALIZER SENSING BULB VAPOR LIQUID ASSEMBLY WITH BRASS NUT LIQUID 1. On fully cased coils, remove the coil access and plumbing panels. 2. Remove any shipping clamps from the liquid line and distributor assembly. 3. Disconnect the equalizer line from the expansion valve equalizer line fitting on the vapor line. 4. Remove the vapor line sensing bulb. 5. Disconnect the liquid line from the expansion valve at the liquid line assembly. 6. Disconnect the expansion valve from the liquid line orifice housing. Take care not to twist or damage distributor tubes during this process. 7. Remove and discard expansion valve and the two Teflon rings. 8. Use a field-provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing. 3FLUSHING SET The line set and indoor unit coil must be flushed with at least the same amount of clean refrigerant* that previously charged the system. Check the charge in the flushing cylinder before proceeding. 1. Set the recovery machine for liquid recovery and start the recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor unit coil. 2. Position B the cylinder of clean HCFC-22* for delivery of liquid refrigerant and open its valve to allow liquid refrigerant to flow into the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit coil before it enters the recovery machine. 3. After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC-22 vapor is recovered. Allow the recovery machine to pull the system down to Close the valve on the inverted HCFC-22 cylinder and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off. *IMPORTANT - Clean refrigerant is any refrigerant in a system that has not had compressor burn out. If the system has experienced burn out, it is recommended that the existing line set and indoor coil be replaced. FIGURE 11

9 STEP 5 -- REFRIGERANT PIPING -- Brazing Procedures 1 2 and liquid line service ports. PIPING PANEL REMOVAL / PREPARING SET Remove piping panel to access service valves. Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain round. Do not crimp the end of the line. CAP AND CORE REMOVAL Remove service cap and core from both the suction SERVICE PORT CAP SERVICE PORT CORE CUT AND DEBUR COPPER TUBE STUB REDUCER SERVICE VALVE CONNECTION SET SIZE MATCHES SERVICE VALVE CONNECTION SET SIZE IS SMALLER THAN CONNECTION LIQUID SERVICE VALVE REFRIGERANT SERVICE PORT CORE SERVICE PORT CAP 3 DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION SUCTION SERVICE VALVE ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION SERVICE VALVES A Connect gauge set low pressure side to liquid line service valve (service port). B Connect gauge set center port to bottle of nitrogen with regulator. C With valve core removed from the suction line service port, nitrogen flow will have an exit point. LOW HIGH ATTACH GAUGES SUCTION SERVICE PORT MUST BE OPEN AND SERVICE PORT CORE REMOVED TO ALLOW EXIT POINT FOR NITROGEN FLOW SUCTION C SUCTION SERVICE VALVE B INDOOR UNIT OUTDOOR UNIT LIQUID LIQUID SERVICE VALVE A NITROGEN FIGURE 12 Page 9 SL18XC1 SERIES

10 CAUTION Brazing alloys and flux contain materials which are hazardous to your health. Avoid breathing vapors or fumes from brazing operations. Perform operations only in well-ventilated areas. Wear gloves and protective goggles or face shield to protect against burns. Wash hands with soap and water after handling brazing alloys and flux. Danger of fire. Bleeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing. Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture. Check the high and low pressures before applying heat. WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use 4additional water-saturated cloths under the valve body to protect the base paint. 5 FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction valve stem port. See steps 3A, 3B and 3C on previous page and below for manifold gauge setup. 6 BRAZE SET Cloths must remain water-saturated throughout the brazing and cool-down process. A. Braze liquid line to liquid line service valve. B. Braze suction line to suction service valve. FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE may result if you do not wrap a water-saturated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing the line set! The braze, when complete, must be quenched with water to absorb any residual heat. Do not open service valves until refrigerant lines and indoor coil have been leak-tested and evacuated. Refer to Installation and Service Procedures manual found on DAVENET. 6B WHEN BRAZING SET TO SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. SUCTION SUCTION SERVICE PORT MUST BE OPEN AND SERVICE PORT CORE REMOVED TO ALLOW EXIT POINT FOR NITROGEN FLOW WATER-SATURATED CLOTHS IMPORTANT! Allow braze joint to cool. Apply additional water-saturated cloths to help cool brazed joints. Do not remove water-saturated cloths until piping has cooled. Temperatures above 2ºF will damage valve seals. 6A LIQUID WATER-SATURATED CLOTHS 7 PREPARATION FOR NEXT STEP After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to both service valves to cool piping. Once piping is cool, remove all water-saturated cloths. FIGURE 13 Page 10

11 STEP 6 -- INSTALLING INDOOR EXPANSION VALVE THIS OUTDOOR UNIT IS DESIGNED FOR USE IN SYSTEMS THAT USE A CHECK EXPANSION VALVE METERING DEVICE. SEE THE LENNOX SL18XC1 PRODUCT SPECIFICATION BULLETIN (EHB) FOR APPROVED EXPANSION VALVE KIT MATCH-UPS AND APPLICATION INFORMATION. TWO PIECE PATCH PLATE (UNCASED COIL ONLY) DISTRIBUTOR TUBES (Uncased Coil Shown) LIQUID ORIFICE HOUSING STUB END EXPANSION VALVE THE EXPANSION VALVE UNIT CAN BE INSTALLED INTERNAL OR EXTERNAL TO THE INDOOR COIL. IN APPLICATIONS WHERE AN UNCASED COIL IS BEING INSTALLED IN A FIELD-PROVIDED PLENUM, INSTALL THE CHECK EXPANSION VALVE IN A MANNER WHICH PROVIDES ACCESS FOR FIELD SERVICING OF THE EXPANSION VALVE. REFER TO BELOW ILLUSTRATION FOR REFERENCE DURING INSTALLATION OF EXPANSION VALVE UNIT. TEFLON RING /2 TURN DISTRIBUTOR ASSEMBLY MALE EQUALIZER FITTING (SEE EQUALIZER INSTALLATION FOR FURTHER DETAILS) TEFLON RING EQUALIZER LIQUID ASSEMBLY WITH BRASS NUT VAPOR SENSING LIQUID 1. REMOVE THE FIELD-PROVIDED FITTING THAT TEMPORARILY RECON NECTED THE LIQUID TO THE INDOOR UNIT'S DISTRIBUTOR ASSEM BLY. 2. INSTALL ONE OF THE PROVIDED TEFLON RINGS AROUND THE STUBBED END OF THE EXPANSION VALVE AND LIGHTLY LUBRICATE THE CONNECTOR THREADS AND EXPOSE SURFACE OF THE TEFLON RING WITH REFRIGERANT OIL. 3. ATTACH THE STUBBED END OF THE EXPANSION VALVE TO THE LIQUID ORIFICE HOUSING. FINGER TIGHTEN AND USE AN APPROPRIATE LY SIZED WRENCH TO TURN AN ADDITIONAL 1/2 TURN CLOCKWISE AS ILLUSTRATED IN THE FIGURE ABOVE, OR 20 FT-LB. 4. PLACE THE REMAINING TEFLON WASHER AROUND THE OTHER END OF THE EXPANSION VALVE. LIGHTLY LUBRICATE CONNECTOR THREADS AND EXPOSE SURFACE OF THE TEFLON RING WITH REFRIG ERANT OIL. 5. ATTACH THE LIQUID ASSEMBLY TO THE EXPANSION VALVE. FIN GER TIGHTEN AND USE AN APPROPRIATELY SIZED WRENCH TO TURN AN ADDITIONAL 1/2 TURN CLOCKWISE AS ILLUSTRATED IN THE FIGURE ABOVE OR 20 FT-LB. 9 O'CLOCK TO 3 O'CLOCK SENSING BULB INSULATION IS REQUIRED IF MOUNTED EXTERNAL TO THE COIL CASING. SEE SENSING BULB INSTALLATION FOR BULB POSITIONING. BULB 12 BULB ON S SMALLER THAN 7/8, MOUNT SENSING BULB BETWEEN THE 9 AND 3 O'CLOCK POSITIONS. SENSING BULB INSTALLATION VAPOR A. ATTACH THE SUCTION SENSING BULB IN THE PROPER ORIENTATION AS ILLUSTRATED TO THE RIGHT USING THE CLAMP AND SCREWS PROVIDED. NOTE - CONFIRM PROPER THERMAL CONTACT BETWEEN SUCTION AND CHECK EXPANSION BULB BEFORE IN SULATING THE SENSING BULB ONCE INSTALLED. B. CONNECT THE EQUALIZER FROM THE EXPANSION VALVE TO THE EQUALIZER VAPOR PORT ON THE SUCTION. FINGER TIGHTEN THE FLARE NUT PLUS 1/8 TURN (7 FT-LBS) AS ILLUS TRATED BELOW /8 TURN BULB FLARE SEAL CAP 12 BULB OR ON 7/8 AND LARGER S, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O'CLOCK POSITION. NEVER MOUNT THE SENSING BULB ON BOTTOM OF. NOTE - NEVER MOUNT THE SENSING BULB ON BOTTOM OF. FLARE NUT COPPER FLARE SEAL BONNET EQUALIZER INSTALLATION REMOVE AND DISCARD EITHER THE FLARE SEAL CAP OR FLARE NUT WITH COPPER FLARE SEAL BONNET FROM THE EQUALIZER PORT ON THE SUCTION AS ILLUSTRATED IN THE FIGURE TO THE RIGHT. MALE BRASS EQUALIZER FITTING SUCTION FIGURE 14 Page 11 SL18XC1 SERIES

12 STEP 7 -- LEAK TEST LOW HIGH MANIFOLD GAUGE SET OUTDOOR UNIT B A TO SUCTION SERVICE VALVE 1 NITROGEN HFC-410A NOTE - Position canister to deliver liquid refrigerant. CONNECT GAUGE SET A Connect the high pressure hose of an HFC-410A manifold gauge set to the suction valve service port. NOTE Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the suction port better protects the manifold gauge set from high pressure damage. B With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. NOTE Later in the procedure, the HFC-410A container will be replaced by the nitrogen container. 2 TEST FOR LEAKS After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks: A With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only). B Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. [A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kpa) pressure.] Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder. C Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set. D Adjust nitrogen pressure to 1 psig (1034 kpa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit. E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector. F After leak testing, disconnect gauges from service ports. FIGURE 15 Page 12

13 STEP 8 -- EVACUATION Evacuating the system of non-condensables is critical for proper operation of the unit. Non-condensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Noncondensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts. Danger of Equipment Damage. Avoid deep vacuum system operation. Do not use the system compressor to evacuate a system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum system operation will void warranty. SET AND INDOOR COIL MANIFOLD GAUGE SET CONNECT GAUGE SET NOTE Remove cores from service valves (if not already done). A Connect low side of manifold gauge set with 1/4 SAE in-line tee to suction line service valve B Connect high side of manifold gauge set to liquid line service valve C Connect micron gauge available connector on the 1/4 SAE in-line tee. D Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set. The center port line will be used later for both the HFC-410A and nitrogen containers. A OUTDOOR UNIT A /4 SAE TEE WITH SWIVEL COUPLER C 0 MICRON GAUGE LOW TO SUCTION SERVICE VALVE HIGH NITROGEN HFC-410A VACUUM PUMP B TO LIQUID SERVICE VALVE D RECOMMEND MINIMUM 3/8 HOSE FIGURE 16 EVACUATE SET AND INDOOR COIL The unit is shipped with a factory refrigerant charge. The liquid and suction line valves were closed after final testing at the factory. Do not operate these valves until the line set and indoor coil have been evacuated and leak checked, or the charge is lost. NOTE - Do not use any portion of the factory charge for purging or leak testing. The factory charge is for filling the system only after a complete evacuation and leak check has been performed. Line set and indoor coil should be evacuated using the recommended deep vacuum method of 0 microns. If deep vacuum equipment is not available, the alternate triple evacuation method may be used by following the specified procedure. If vacuum must be interrupted during the evacuation procedure, always break vacuum with dry nitrogen. Deep Vacuum Method The deep vacuum method requires a vacuum pump capable of pulling a vacuum to 0 microns and a vacuum gauge capable of accurately measuring this vacuum level. The deep vacuum method is the most positive way of assuring a system is free of air and water. Watch the vacuum gauge as the system is pulling down. The response of the gauge is an indicator of the condition of the system (refer to figure 17). With no leaks in the system, allow the vacuum pump to run for 30 minutes minimum at the deep vacuum level. Page 13 SL18XC1 SERIES

14 Deep Vacuum Gauge Response and System Conditions FIGURE 17 Triple Evacuation Method The triple evacuation method should only be used when system does not contain any water in liquid form and vacuum pump is only capable of pulling down to 28 inches of mercury (711mm Hg). Refer to figure 18 and proceed as follows: Triple Evacuation Sequence EVACUATE BREAK VACUUM WITH DRY NITROGEN WAIT 6. After the final evacuation sequence, confirm there are no leaks in the system. If a leak is found, repeat the entire process after repair is made. 7. Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 0 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump and closing the manifold gauge valves. 8. Disconnect the manifold hose from the vacuum pump and connect it to an inverted cylinder of HFC 410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit. 9. Perform the following: Close manifold gauge valves. Shut off HFC 410A cylinder. Slowly open the service valves. Refer to the charging sticker on the unit to complete the outdoor unit installation. Charging The SL18XC1 unit is factory-charged with enough HFC-410A refrigerant to accommodate a 15-foot length of refrigerant piping. Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access panel. Detailed information is given in the SL18XC1 Installation and Service Procedures manual, which is available on DaveNet. Homeowner Information EVACUATE BREAK VACUUM WITH DRY NITROGEN WAIT EVACUATE CHECK FOR TIGHT, DRY SYSTEM (IF IT HOLDS DEEP VACUUM) CHARGE SYSTEM FIGURE Pull system down to 28 inches of mercury (711mm Hg) and allow pump to continue operating for an additional 15 minutes. 2. Close manifold valves or valve at vacuum pump and shut off vacuum pump. 3. Connect a nitrogen cylinder and regulator to system and fill with nitrogen until system pressure is 2 psig. 4. Close nitrogen valve and allow system to stand for one hour. During this time, dry nitrogen will diffuse throughout the system absorbing moisture. 5. Repeat this procedure as indicated in figure 18. CAUTION Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch. The State of California has determined that this product may contain or produce a chemical or chemicals, in very low doses, which may cause serious illness or death. It may also cause cancer, birth defects, or reproductive harm. In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. Homeowner Maintenance The following maintenance may be performed by the homeowner. Contact a licensed professional HVAC technician to schedule a yearly inspection and maintenance appointment for your equipment. Check the indoor unit filter each month and replace the filter, if necessary. Have your Lennox dealer show you where your indoor unit filter is located. It will be either at the indoor unit (in Page 14

15 stalled internal or external to the cabinet) or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed. Disposable filters should be replaced with a filter of the same type and size. Check the indoor unit drain line for obstructions monthly during the cooling season. The indoor evaporator coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location of the drain line and how to check for obstructions. (This would also apply to an auxiliary drain, if installed.) Check the area around the outdoor unit monthly and remove any obstructions that may restrict airflow to the outdoor unit. This would include grass clippings, leaves, or papers that may have settled around the unit. Trim shrubbery away from the unit and periodically check for debris which collects around the unit. During the winter months, keep the snow level below the louvered panels. NOTE - The filter and all access panels must be in place any time the unit is in operation. If you are unsure about the filter required for your system, call your Lennox dealer for assistance. IMPORTANT! Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of steel and aluminum parts, diminish performance and affect longevity of the unit. Thermostat Operation See the ComfortSense 7000 or icomfort -enabled thermostat homeowner manual for instructions on how to operate your thermostat. Pre-Service Check If your system fails to operate, check the following before calling for service: Verify room thermostat settings are correct. Verify that all electrical disconnect switches are ON. Check for any blown fuses or tripped circuit breakers. Verify unit access panels are in place. Verify air filter is clean. If service is needed, locate and write down the unit model number and have it handy before calling. Professional Maintenance Your heating and air conditioning system should be inspected and maintained yearly (before the start of the cooling and heating seasons) by a licensed professional HVAC technician. You can expect the technician to check the following items. These checks may only be conducted by a licensed professional HVAC technician. Outdoor Unit 1. Inspect component wiring for loose, worn or damaged connections. Also check for any rubbing or pinching of wires. Confirm proper voltage plus amperage of outdoor unit. 2. Check the cleanliness of outdoor fan and blade assemblies. Check condition of fan blades (cracks). Clean or replace them, if necessary. 3. Inspect base pan drains for debris and clean as necessary. 4. Inspect the condition of refrigerant piping and confirm that pipes are not rubbing copper-to-copper. Also, check the condition of the insulation on the refrigerant lines. Repair, correct, or replace as necessary. 5. Test capacitor. Replace as necessary. 6. Inspect contactor contacts for pitting or burn marks. Replace as necessary. 7. Check outdoor fan motor for worn bearings/bushings. Replace as necessary. 8. Inspect and clean outdoor coils, if necessary and note any damage to coils or signs of leakage. NOTICE! Failure to follow instructions will cause damage to the unit. This unit is equipped with an aluminum coil. Aluminum coils may be damaged by exposure to solutions with a ph below 5 or above 9. The aluminum coil should be cleaned using potable water at a moderate pressure (less than psi). If the coil cannot be cleaned using water alone, Lennox recommends use of a coil cleaner with a ph in the range of 5 to 9. The coil must be rinsed thoroughly after cleaning. In coastal areas, the coil should be cleaned with potable water several times per year to avoid corrosive buildup (salt). Indoor Unit (Air Handler or Furnace) 1. Inspect component wiring for loose, worn or damaged connections. Confirm proper voltage plus amperage indoor unit. 2. Inspect and clean or replace air filters in indoor unit. 3. Check the cleanliness of indoor blower and clean blower, if necessary. 4. Inspect the evaporator coil (Indoor) drain pans and condensate drains for rust, debris, obstructions, leaks or cracks. Pour water in pans to confirm proper drainage from the pan through to the outlet of the pipe. Clean or replace as necessary. 5. Inspect and clean evaporator (indoor) coil, if necessary. 6. Inspect the condition of the refrigerant lines and confirm that pipes are not rubbing copper-to-copper. Also, ensure that refrigerant pipes are not being affected by indoor air contamination. Check condition of insulation on the refrigerant lines. Repair, correct, or replace as necessary. 7. Inspect the duct system for leaks or other problems. Repair or replace as necessary. 8. Check for bearing/bushing wear on indoor blower motor. Replace as necessary. 9. Indoor unit inspections of gas- or oil-fired furnaces will also include inspection and cleaning of the burners, Page 15 SL18XC1 SERIES

16 and a full inspection of the gas valve, heat exchanger measure indoor/outdoor temperatures and system and flue (exhaust) system. pressures as needed. General System Test with System Operating 2. The technician will check the refrigerant charge per 1. Your technician should perform a general system test. the charging sticker information on the outdoor unit. He will turn on the air conditioner to check operating 3. Verify that system total static pressure and airflow settings are within specific operating parameters. functions such as the start up and shut off operation. He will also check for unusual noises or odors, and 4. Verify correct temperature drop across indoor coil. IMPORTANT This performance check is ONLY valid on systems that have clean indoor and outdoor coils, proper airflow over coils, and correct system refrigerant charge. All components in the system must be functioning properly to correctly perform compressor operational check. (Accurate measurements are critical to this test as indoor system loading and outdoor ambient can affect variations between low and high capacity readings). SL18XC1 Start-Up and Performance Checklist Customer Indoor Unit Model Outdoor Unit Model Solar Module Mfg and Model Notes: Address Serial Serial Serial START-UP CHECKS Refrigerant Type: Rated Load Amps Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Vapor Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air Temperature: HEATING MODE Vapor Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air Temperature: System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach temperatures.) Subcooling: Approach: Indoor Coil Temp. Drop (18 to 22 F) Saturated Condensing Temperature (A) minus Liquid Line Temperature (B) Liquid Line Temperature (A) minus Outdoor Air Temperature (B) Return Air Temperature (A) minus Supply Air Temperature (B) A B = SUBCOOLING A B = APPROACH A B = COIL TEMP DROP Page 16

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